Grate and fuel feeder.



No. 820,788. PATENTED MAY15, 1906. E. HARUHARIOK, GRATE AND FUEL FEEDER.

; APPLICATION FILED APR.1,1904

2 SHEETS-SHEET'I.

.No. 820,783. PATENTBD MAY 15, 19 06.

E. HARGHARIGK. GRATE AND FUEL FEEDER. AAAAAAAAAAAAAAAAA 1 3,1. 1904.

itirisr ribs.

ElilltO HAHUHARICK, F WlLKES-BARRE, PENNSYLVANIA.

GRMTE AND FUEL FtliDkELlk.

, Specification of Letters Patent.

resented May 15, 1906.

Application filed April 1, 1904:. Serial No. 201,121.

This invention relates to fin'naces and stokers, and has for its objectthe provision of apparatus which is especially adapted for burning thesmall sizes of coal.

In the accompanying drawings, Figure 1 is a vertical section of a furnace and stoker arranged beneath a boiler and embodying my invention.Fig. 2 is a transverse section of the stoker on the line a f) of Fig. 1.Fig. 3 is a plan view of the grate, certain of the secchambers aresuitably connected to form a refractory walls 7 and 8 frame, which isrotatably supported by Wheels 5 and 6 and supports the grate and aboutthe interior and exterior edges of the grate. Rotation of the frame, andwith. it the grate, may be accomplished by means of a circular rack 9,connected to the frame, which engages with a pinion 10, connected to adriving-pulley 11.

The grate is divided into radial sections, each. comprising two parts 12and 13, hinged to a radially-extending bar 14, rotatably mounted in theframe. The parts 12 and 13 are normally held in horizontal position bysuitable means, as sliding bolts 15, secured to the grate portions andadapted to enter sockets in the side walls of the ash-chamber. Upon therelease of bolts 15 the parts will swing into a vertical position, asindicated by the dotted lines in Fig. 4, and their contents be emptiedinto an ash'chamber E. The parts may be returned to the horizontalposition by means of an arm 16, iixcd to the bar 14, which may be movedagainst the bottom of either part by turning the bar 1'4 by means ofaWrench applicd to its outer end or in any other suitable manner. Afterhaving been thus returned the parts may be secured by refastening thebolts 15.

An ash-chamber E is located beneath each section of the grate and isinclosed by inclined side walls 4, which may be curved, as

shown, to afford clearance for the swinging grate portions 12 and 13,the outside wall 1,

, and the bottom 2, which slopes downwardly from the center of the frameto a point near the wall 1, at wluehpoint 18 located an exit for ashes,which passes over an ash-pit 28 and is normally closed by a door 17.Suitable means, as a chain 18, secured to a spring-barrel 1S), may beemployed for normally holding the door closed. Preferably the walls 4extend between the grate-sections.

Beneath and between the ash-chambers is the air-chamlwr F, iuclosed bythe-side walls and bottoms of the ash-chambers and the bottom 3 of theframe. This air-chamber conununicates with the ash chambers by openings21) in the side walls, which may be closed by doors 2] operatedbyhandles 22 or other suitable means. The air-chamber also communicatesby an opening 23 with a pit .24, communicatiug, by means of an opening25, with an air-blast. The forcedair may be controlled by means of doors26 in the opening 23, operated by handles 27.

The stoker C extends over the grate and comprises a radial conveyor,which may be a screw 29, fitting within a tube or casing 30, which.conununicates upon the outside of the furnace with a fuel-supply chute31 and within the furnace with a chamber 32, in which is rotatablymounted a feeder, prefer ably a fluted cone 33, for feeding the fuel,the chamber 32 having openings 34 for the passage thereof. The shafts ofthescrew and cone are driven by any suitable means, as by earing them toa power-shaft 38, as shown.

The Stoker is surrounded-by a water-jacket 35, in which holes 36 areprovided for the passage of the fuel. Preferably tubes 37 are secured tothe wall of the chamber 32, surrounding the holes therein, and extendinto the holes in the wateejacket to roperlydi root the fuel. The jacketmay lie fed by a water-pipe 35, which may conveniently extend up fromthe air-pit through the center of the grate, as shown. The water-jacketaffords protection from the heat of the furnace to the working parts ofthe stoker, and the heated water may be employed for feeding the boiler,as through a pipe 39, connected to a hot-well, injector, or otherboiler-feed source. A blow-ell cock 40 near the bottom of thewater-jznsket should be provided. In operation, as the grate revolvesfuel will be distributed radially by the stoker, and the rotating of thegrate will cause the fuel to be evenly distributed over its entiresurface. If the substance upon the grate becomes too thick,

the rotation of the grate is stopped by any suitablepower-disconnectingmeans. The

air-blast is then cut oil' from the particular ash-chamber by means ofthe door 21-. ,The

supporting-bolts are then Withdrawn, when the grate parts will swingdownwardly, emp' tying their contents into the ash-chamber.

The grate parts being then returned to the horizontal position andsecured in a manner as before described, "lire may be raked from theadjoining gratcssections upon the one just emptied, and uponreconnecting the power it will move under the. stoker and there receivea fresh supply of fuel. In a similar manner all the grate-sections maybesucces. sively dumped and resupplied with fuel. i

Either ash-clnnnber E may be relieved'of its contents whenever desiredby opening the door 17 of said chamber when it is over the aslrpit. Thespeed of the grate and the supply of fuel are preferably so regulatedthat a grate-section will make a number of revolut-ions after it hasbeen dumped before the tire upon it becomes too heavy.

While I have illustrated my invention in' Whatl consider one of its bestapplications, it may be embodied in other constructions, and]. do not,therefore, wish to be limited to that shown.

- Vl ithout limiting myself to the precise construction shown anddescribed, l claim 1. in a .l'urnaee, the combination with a frameinclosing an ash-chamber of a grate carried by said frame, and means forrevolving said frame, substantially as described.

. 2. In a furnace, the combination with a frame inplosing air and ashchambers, .of a

grate carried by said frame, and means for revol\"ing said frame,scribed.

3. lna furnace, the combination with a revolving frame, of a sectionalgrate, supported by" said frame and having in each section a pluralityof independently-swinging plates, means for detachably securing saidplates in operative position, and means adjacent each section of thegrate for successively restoring substantially as dethe plates thereofto operative position alter they have been dumped.

4. In a furnace, the combination with a revolving frame, of a sectionalgrate supported by said frame and having in each section thereof twoplates adapted to swing inde-. pendently about a common axis to dump theload thereon, means for detachabl y supporting said plates in operativeposition, and means movable about the axis of the plates of eachgrate-section to restore said plates to operative position after theyhave been dumped.

5. In a furnace, the combination. with a revolving frame, of a sectionalgrate supported by said frame and having in eachscction thereof aplurality of indepcndently-swinging plates, an ash-chamber rotating withthe grate and,divided into a series of compartments corresponding innumber and arrangement to the sections of the grate, and means withineach of said compartments of the ash chamber for moving the plates ofthe adjacent grate-sectiOns "to operative position after they have beendumped.

6. in a furnace, the combination of a revolving sectional grate, eachsection including two plates adapted to movc about a cons men axis,means for detachably holding said plates in horizontal position, andmeans movable 1n opposite directions about the axis of the plates forrestoringlhc said plates successively to operative position after theyhave been dumped.

7. in a furnace, the combination of a revolving sectional grate, eachswtion-comprisinga plurality of indepeiidently-swinging plates, and arock shaft adjacent each scc tion of the era to and provided with. meansfor restoring the plates of said section to operative position afterthey have been dumped.

S. In a fiu'nace, the combination with a sectional grate, of a supportfor the grate having therein a series of ash-chambers, corresponding innumber and arranged below the sections of said grate, and means forrevolvi ng said grate-support.

in testimony whereof I have signed my name to this speclhcation 1n thepresence of two subscribing witnesses.

EM ltO HARCHARICK.v

. Witnesses;

W. L. RAEDER, ANDREW l'lOURIGAN.

